Pneumatic tire



Sept. 4, 1928.

IN VEN TOR.

.,/l TTORNE Y.

1vif?)atented Sept. 4, 1.928.

JOHN'POWELL, OF CARLTON, .VICTORIIL AUSTRALIA.

PNEUMATIC TIRE.

Application filed December 17, 1926i, Serial No. 155,445, and'in Australia December 23, 1925.

This invent-ion refers to pneumatic tires for road vehicles and the objects of the improvements are to minimize punctures of the pneumatic tube, to protect the latter against wear and prevent water, dustor gravel entering the tire and to reduce the cost oi manufacture.

Briefly stated, the pneumatic tube is contained within a metal casing approximately `'il-shaped in cross section and fitted with a tread the side of said casing under road shocks telescoping or moving inwardly in a radial direction over the rim of the wheel upon which the tube is seated.

Between the pneumatic tube and the rim there is provided a band ofl'lexible water and dust proof material the side edges of which are adapted to engage with the edges of the casing sides which are suitably bent for the purpose, the object being to prevent water, dust or the like entering between the inner edges of the casing and the rim:

Some practical forms of the invention are illustrated in the accompanying drawings of which,

Figure 1, is cross section through a tire according to one vform of the invention.

Figure 2, is a cross section through the tube.

Figure 3 is a fragmentary detail illustrating a modification of a feature in FigureQ.

Figures 4l and 5 are fragmentary views illustrating modilications of Figure 1.

According to Figure 1 the approximately tishaped metal casing C is preferably constructed of two sides 1 and a peripheral strip 2 the edges 3 of which latter are bent inwardly and secured to the casing sides 1 by rivets el, welding or spot welding while the outer ends 5 of the sides are extended beyond the peripheral strip 2 and curved at their extremities towards each other as illustrated.`

rihe casing is preferably made of steel and the peripheral strip 2 is preferably corrugated for a portion of its width as illustrated for additional strength and the distance between the sides of the casing is greater than the width of the rim 10 of the wheel upon which the tire yis fitted.

Around tlie peripheral strip is wound in several coils a cord oi wire 6 or in lieu thereof several rings of cord or wire may be tted around said strip, the object being to provide a good `anchorage for the resilient tread 7 which is vulcanized or moulded on the peripheral strip and about said cord or wire. y

In order to enable the tread material to get on the underside of the cord or wire y6, the latter is wound free of the corrugated peripheral strip -2 of the casing.

The tread material also passes under the overhanging curved extremities 5 of the sides of the casing and is thereby further anchored and said tread projects the desired distance beyond said extremities of the cas' ing. f

The inner edges 8 of the sides 1 of the Vcasing are curved and between the pneumatic tube 9 and the rim 1() is placed a band 11 of flexible material such as rubber, that is water and dust proof.

The side edges 12 of the band project beyond tlie sides of the tube and are stretched and sprung into engagement with the curved inner edges 8 ofA the sides of the casing. Freferably the inner edges of the casing sides are outwardly curved as in Figure 1, and the edges 12vof the flexible band 11 are sprung over same.

The projecting sidejedges 12 of the band may be reinforced with steel wire 13 or wire mesh as illustrated inFigure 3.

n If' desired the inner edges let of the casing sides may be inwardly curved as in Figure l in which case the projecting edges 12 of the flexible rubber band are held in engagement with said inwardly curved edges sure of the pneumatic tube 9 when fully inliated.

The edges 12 of this band will stretch as the casing telescopes over the rim under road shocks andi said band apart from protecting the tube against wear through the rim will prevent water, dust and gravel from entering the easing between its edges and the rim.

The flexible band may be formed of textile material such as canvas or rubberized lcanvas in which case loose loops 19 of the band project between the curved extremities 14 and the edges of' the rim.

In the construction shown in Figures 1 and 5, the projecting edges vof the band will prevent the rim and inner edges of the casing sides contacting.

If preferred the band may be in two strips divided at the point 20 indicated in Figures i 1, 4 and 5.

In order to minimize wear of the peripheral side of the tube 9 adjacent the periph- 14 by preseral strip 2 and sides 1 of the casing a protective covering l5 of canvas or other flex-` ible material maybe attached to said per-ipheral side of the tube and extends approximately overvyonehalf of the surface of' the 1. Apneumatic tire comprising a casing approximately U-sha ein erossse'etion consisting vof a'periphera strip having inwardly bent edges fixed to the sides of said 'easing-,

said sides extending outward beyond the strip Vand curved inwardly at their extremities, a .tread fittedtosad strip and sides, a pn`eu`k matie tube within the easing, and-a wheel* rim slightly narrower than the width of the casingrto prevent undue lateral movement thereof and on-whieh said tube is seated. i

2. `A pneumatietre mprising acasing approximately -U-shap'e in cross-section consisting of a corrugated eripheral strip hav-V ling, inwardly curvede ge Cnortions fixed to the sides of the casing,'saf

within said casing, a" wheel nrimb narrower than the-width of the easingsupporting the tube, and a band of flexible material inter-` posedzbetwe'en the tube and rim having projeeting sidev edges engaging the outwardly curved edges of the sides. A l

Dated this lthday of. November, `1926. Y i si JOHN-POWELL. i 

